Inovance MDBUN Series Braking Unit User Manual
Page 19 of 24
Chapter 6 Troubleshooting
The MDBUN series braking unit provides nine pieces of alarm information and protection
function. After a fault occurs, the protection function is implemented, and the braking unit
stops working and displays the fault code on the operation panel (if the operation panel is
available).
If a fault occurs during running or commissioning, you can determine the fault type,
analyze the causes, and perform troubleshooting according to the following table before
contacting Inovance.
If you do not know how to perform troubleshooting during commissioning, contact
technical support engineers of Inovance.
1. The external circuit is
short-circuited.
2. The feedback energy
changes suddenly or becomes
abnormal.
3. The power of the braking unit
is too small.
4. The resistance of the braking
resistor is too small.
1. Check whether the external circuit is
short-circuited or abnormal. If yes, press
or power on the braking unit
again.
2. Reduce sudden change of the
feedback energy.
3. Select a braking unit of higher power.
4. Select a proper braking resistor.
5. Contact technical support engineers
of Inovance.
1. The input voltage class of
the adaptable drive is
incorrectly set.
2. The feedback energy
becomes abnormal.
3. The braking unit has
insufficient capacity.
1. Correctly set the input voltage class of
the adaptable drive.
2. Check the input feedback energy.
3. Select a braking unit of higher power.
4. Contact technical support engineers
of Inovance.
1. The air filter is blocked or the
fan is damaged.
2. The power cable of the fan is
not securely inserted or is
damaged.
3. The ambient temperature is
too high.
4. The power of the braking unit
is too small.
1. Clear the air filter or replace the fan.
2. Check that the power cable of the fan
is securely inserted and is normal.
3. Reduce the ambient temperature.
4. Contact technical support engineers
of Inovance.
Braking
resistor
short-circuit
1. The braking resistor or the
wiring of the braking resistor is
short-circuited.
1. Check that the braking resistor and
the wiring are normal.
2. Contact technical support engineers
of Inovance.
Braking
resistor
open-circuit
protection
1. No braking resistor is
connected or the braking
resistor is burnt out.
2. The IGBT is burnt out.
1. Check that the braking resistor is
normal and connected properly.
2. Check that the IGBT is normal.
3. Contact technical support engineers
of Inovance.
The IGBT module is damaged
1. Replace the braking unit.
2. Contact technical support engineers
of Inovance.
The reference source for
analog sampling is faulty.
1. Replace the braking unit.
2. Contact technical support engineers
of Inovance.
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